Tool for tightening cannon pinions on watches



u y 1950 M. D. MUXEN 2,514,784

TOOL FOR TIGHTENING CANNON muons 0N WATCHES Filed May 27, 1948- Fig. 2.

Fig.3. Fig.4.

Merle D. Muxen INVENTOR.

Patented July 11, 1950 TOOL FOR TIGHTENING CANNON PINIONS N WATCHES i Merle Muxen, Redfield, S. Dak. 1 Application May 27, 1948, Serial No. 29,450

This invention relates to new; and useful improvements in watch tools and the primary object of the present invention is to provide 'a tool for tightening cannon pinions byforming a recess or detent in th shaft of a cannon pinion.

Another important object of the present invention is to provide a device for forming a recess in the shaft of a cannon pinion including a pliertype tool having novel and improved means for adjustably supporting a cannon pinion relative thereto.

A further object of the present invention is to provide a watch repairing tool includin a pair of pivoted levers, a jaw and holder carried by one of the levers for supporting a cannon pinion relative thereto, and a novel and improved jaw and adjustable punch carried by the remaining lever for eifectively and efiiciently providing a recess or depression in a cannon pinion carried by the holder.

A still further aim of the present invention is to provide a watch repairing tool that is simple and practical in construction, small and compact in structure, strong and reliable in use, neat and attractive in appearance, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended,

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view of the present invention, and with parts thereof broken away;

Figure 2 is an end view of Figure 1 taken substantially in the direction of arrow numbered 2 in Figure 1;

Figure 3 is an enlarged transverse horizontal sectional view taken substantially on the plane of section line 3-3 of Figure 2, and showing a cannon pinion, in dotted lines, applied thereto;

and

Figure 4 is a view similar to Figure 3 but showing the punch engaged with the pinion shaft.

Referring now to the drawings in detail, wherein for the purposes of illustration, there is disclosed a preferred embodiment of the present invention, the numeral I0 represents the present watch repairing tool generally, comprising a pair of levers I2 and I4 having head portions it which are pivoted to each other as at I8.

Integrally formed with the head portion "5 of the lever 12, is a first jaw 20 having a stop 22 4 Claims. (Cl. 81- 6) provided at its outer extremity that will engage the outer end 24 of a further jaw 26 which is integrally formed with the head portion I6 of the remaining lever, namely, [4, to limit the movement of jaws 20 and 26 toward each other.

Projecting outwardly from one face of the jaw 25, is a plurality of guide pins 28 which are suit ably secured to the jaw 26. These guide pins 28 slidably engage apertures 30 provided in a holding or retaining plate 32 that is adjustable to the jaw 25 by an externally threaded rod or fastener 34 that receivably engages opposed, internally threaded openings 36 provided in the jaw 26 and plate 32.

The inner edges of both the jaw 26 and the plate 32 are provided with complementary recesses or seats 38 and 40 that respectively engage the shaft 42 and head 44 of a cannon pinion 4i.

Receivably engaging internally threaded openings in the jaw 20, is a plurality of externally threaded rods or punches 48 having head portions 58 and conical or pointed extremities 52 that register with and which are disposed perpendicular to the recesses 38 provided in the jaw 26.

In practical use of the present invention, the cannon pinion is positioned in the recesses 38 and 40 and the punch 48 adjusted to a selected position.

When the levers l2 and I 4 are moved toward each other, the pointed extremity 52 of the punch 48 will engage the shaft 42 of the cannon pinion 46 to form a depression or detent in the shaft of said cannon pinion as shown in Figure 4.

It should be noted that a depression or recess i provided in the cannon pinion and more particularly the tube or shaft portion thereof, so that when the shaft portion is placed on the post of the center wheel of a clock mechanism (not shown), the same will fit the center wheel post snugly, whereby the minute hand of the clock will engage the shaft of the cannon pinion to be rotated therewith but in such a manner as to permit the hands of the clock to be properly set.

In view of the foregoing description taken in conjunction with the accompanying drawings, it is believed that a clear understanding of the device Will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims,

ing a depression in a, cannon pinion carried bysaid first jaw and said plate as the jaws are moved toward each other.

2. The combination of claim 1 wherein said first mentioned means includes recesses-provided in said plate and said first jaw.

3. The combination of claim 1 wherein said last mentioned means includes an adjustable punch carried by said further jaw.

4; A cannon pinion tightening tool comprising a pair of levers pivoted to each other, a first J'aw carried by one of said levers, a further jaw carried by the remaining lever, a retaining plate adjustably carried by said first jaw and adjustable laterally of the first jaw and transversely to the movement of both jaws with respect to each other, guides carried by said first jaw slidably supporting said plate, said plate and said first jaw being provided with complementary recesses for receiving a cannon pinion, and an adjustable punch carried by said further jaw for forming a dent in a cannon pinion as the jaws are moved toward each other.

MERLE D. MUXEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 859,095 Mercer July 2, 1907 902,939 Caplan Nov. 3, 1908 1,206,449 Llnquist Nov. 28, 1916 1,911,036 Phenix May 23, 1933 2,451,378 Bloom Oct. 12, 1948 

